Merge pull request #116 from elemoine/redraw

make Layer.redraw not unconditionally set zoomChanged to true when calling Layer.moveTo

lib/OpenLayers/Layer.js

@@ -265,6 +265,16 @@ OpenLayers.Layer = OpenLayers.Class({
      * {Float}
      */
     minResolution: null,
+    
+    /**
+     * Property: resolution
+     * {Float} Current resolution that the layer is drawn in. This is
+     *     used to determine whether the zoom has changed when calling
+     *     <moveTo> from <redraw>. Subclasses may set this.resolution to
+     *     null prior to calling redraw to force passing zoomChanged
+     *     true to moveTo.
+     */
+    resolution: null,
 
     /**
      * APIProperty: numZoomLevels
@@ -552,7 +562,8 @@ OpenLayers.Layer = OpenLayers.Class({
             var extent = this.getExtent();
 
             if (extent && this.inRange && this.visibility) {
-                var zoomChanged = true;
+                zoomChanged = this.resolution == null ||
+                              this.resolution !== this.map.getResolution();
                 this.moveTo(extent, zoomChanged, false);
                 this.events.triggerEvent("moveend",
                     {"zoomChanged": zoomChanged});
@@ -577,6 +588,7 @@ OpenLayers.Layer = OpenLayers.Class({
             display = display && this.inRange;
         }
         this.display(display);
+        this.resolution = this.map.getResolution();
     },
 
     /**
@@ -632,6 +644,8 @@ OpenLayers.Layer = OpenLayers.Class({
             
             // deal with gutters
             this.setTileSize();
+
+            this.resolution = null;
         }
     },